Preheat oven to 160°C.
Mix all ingredients to a soft pastry in a food processor.
Cover and allow to rest in refrigerator for 10 - 15 minutes.
Press pastry into base and sides of a 24 cm quiche dish.
Prepare the vegetables according to tip
Allow vegetables to cool to room temperature.
Arrange with the cheese over the pastry base.
Beat eggs, cream, sour cream and lemon juice together.
Add pecorino, mustard, salt, pepper and herbs and mix well.
Pour onto base and vegetables.
Bake for 45 minutes or until set.
Allow to rest for 10 minutes before serving.